Start with the revised consumer handbook
The Consumer Financial Protection Bureau updated its Consumer Handbook on Adjustable-Rate Mortgages in October 2026. The handbook explains how an adjustable-rate mortgage, or ARM, can change after its initial period and how to use written disclosures to compare options.
Federal rules require a lender to provide the handbook, or a suitable substitute, when a consumer applies for an ARM. You can also download the current CFPB version before applying. The booklet is general education, not a recommendation or an offer of loan terms.
Understand how the rate can change
An ARM rate generally combines an index with a lender-set margin. The index can move over time, while the margin is stated in the loan documents. The initial rate applies for a limited period; after that, the adjustment schedule determines when the rate can change.
Interest-rate caps limit changes at the first adjustment, later adjustments and over the life of the loan. A cap limits an increase; it does not make the future payment predictable. Taxes, homeowners insurance and other property costs can also change separately.
Read three written items together
- Use the Loan Estimate's Loan Terms and Projected Payments sections to see whether the rate and principal-and-interest payment can increase.
- Review the Adjustable Interest Rate table for the index, margin, adjustment timing, minimum and maximum rate, and limits on changes.
- Read the lender's ARM program disclosure for the features of that lender's program, including the index and margin used.
- Compare written Loan Estimates using the same loan amount and transaction assumptions.
- Ask the lender to explain any feature or number that differs from earlier discussions.
Test the risk before relying on the initial payment
Ask whether your budget could handle the maximum principal-and-interest payment shown for the loan, along with possible changes in taxes, insurance and other housing costs. Do not assume you will be able to refinance or sell before the first adjustment; future property values, credit, income and market conditions are uncertain.
A discounted or teaser rate may be lower than the fully indexed rate. Even if the index does not move, the rate and payment can rise when the discounted period ends. Paying points may reduce only the initial ARM rate, so ask how long the reduction applies and compare the upfront cost with the expected benefit.
Separate federal disclosure rules from lender choices
The CFPB handbook and federal rules establish consumer disclosures. A lender chooses which ARM programs it offers and sets program-specific features within applicable requirements. Ask which details are required by law, which belong to the loan program and which are lender-specific.
Preapproval is preliminary. Final approval depends on lender review of the borrower, property and completed transaction.
Source review
The official CFPB resources below were checked October 28, 2026. CFPB's disclosure page identifies the CHARM booklet as last updated in October 2026 and shows a page-modified timestamp of October 27, 2026 at 11:30 AM EDT. The revised booklet was verified from CFPB's direct PDF link. Numerical examples in the booklet are not reproduced here and are not available loan terms. This article is general education, not individual loan advice, an approval decision or a promise that an ARM is suitable.
General education only. This article does not offer a rate or guarantee loan approval. Loan options depend on your circumstances and lender review.